Umbrella rib



FIG. 1 is a perspective view of an umbrella rib, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a side view of umbrella rib, shown in an alternate state; and,

FIG. 9 is a perspective view of the umbrella rib shown in use with environment.

The broken lines depict portions of the article and environment that forms no part of the claimed design. 

CLAIM The ornamental design for an umbrella rib, as shown and described. 